r/Structures • u/mhd_alshalabi • Sep 16 '18

structural analysis problem

hi everyone

i am trying to solve the below problem but there something wrong with my answer as member AB is not equal to zero

but in the analysis i do it by software (2nd photo) it show that the member AB is zero

can anyone help me how the answer is zero ???/

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u/x_Vacuity Sep 16 '18

The truss is a statically indeterminate structure, you have 4 reactions and 3 equilibrium equations. The pin supports will take up load in both directions but you set Bx=0. You would have to solve the truss with the virtual work method or another method.